Actuation of parallel microfluidic arrays

Patent metadata

Field	Value
Publication number	US-2016158758-A1
Application number	US-201615042996-A
Country	US
Kind code	A1
Filing date	Feb 12, 2016
Priority date	Dec 3, 2004
Publication date	Jun 9, 2016
Grant date	—

Abstract

An improved actuator for use in a microfluidic particle sorting system utilizes a staggered packing scheme for a plurality of actuators used to selectively deflect a particle in an associated sorting channel from a stream of channels. An actuator block may be provided for housing a two-dimensional array of actuators, each configured to align with an actuation port in an associated sorting chip containing a plurality of sorting channels. The actuator block may include a built-in stressing means to pre-stress each actuator housed by the block. An actuator comprising a piezo-electric stack may employ contact-based electrical connection rather than soldered wires to improve packing density. The actuator may be an external actuator. That is, the external actuator is external to the substrate in which the sorting channels are formed.

First claim

Having described the invention, what is claimed as new and protected by Letters Patent is:

1 . A particle processing assembly for sorting individual particles on a particle-by-particle basis from a stream of particles, the particle processing assembly comprising:
a microfluidic chip including at least one microsorter having fluid contact surfaces including a microfluidic channel having a sample input, a switching region, a keep output and a waste output, wherein the switching region is configured to be operatively and removably interfaced with at least one actuator external to the microfluidic chip, and wherein the switching region is configured to direct a pressure pulse across the microfluidic channel to deflect a selected particle from the stream of particles.

2 . The particle processing assembly of claim 1 , further comprising:
a cartridge having fluid contact surfaces including a sample chamber, a keep chamber and a waste chamber, wherein the sample chamber of the cartridge is in fluid communication with the sample input of the microfluidic channel, wherein the keep chamber of the cartridge is in fluid communication with the keep output of the microfluidic channel, wherein the waste chamber of the cartridge is in fluid communication with the waste output of the microfluidic channel, and wherein all the fluid contact surfaces of the particle processing assembly are enclosed and configured to be sealed against liquid transfer to an exterior environment during a sorting operation.

3 . The particle processing assembly of claim 2 , wherein the cartridge includes a sorted sample extraction port in fluid communication with the keep chamber and configured to be unsealed after the sorting operation has ended to provide access to fluid within the keep chamber.

4 . The particle processing assembly of claim 2 , wherein all the fluid contact surfaces needed for the sorting operation are enclosed within the particle processing assembly.

5 . The particle processing assembly of claim 2 , wherein the particle processing cartridge assembly is configured to allow pressurized air to drive the stream of particles through the microfluidic channel.

6 . The particle processing assembly of claim 2 , wherein the fluid contact surfaces of the cartridge include a sheath chamber configured to supply sheath fluid to the microsorter upstream of the switching region.

7 . The particle processing assembly of claim 2 , wherein the microfluidic chip and the cartridge are provided as a unitary particle processing cartridge assembly.

8 . The particle processing assembly of claim 7 , wherein the unitary particle processing cartridge assembly is a rigid and integral assembly.

9 . The particle processing assembly of claim 1 , further comprising a plurality of micro sorters.

10 . The particle processing assembly of claim 1 , wherein the microfluidic channel includes a detection region wherein particle, characteristics of individual particles of a sample are detected on a particle-by-particle basis during the sorting operation.

11 . The particle processing assembly of claim 1 , wherein the particle processing assembly includes a unique identifier.

12 . A system for sorting individual particles on a particle-by-particle basis from a stream of particles, the system comprising:
a particle processing assembly including a microfluidic chip, the microfluidic chip including at least one microsorter having fluid contact surfaces including a microfluidic channel having a sample input, a switching region, a keep output and a waste output; and at least one actuator configured to generate a pressure pulse in the microfluidic channel, wherein the switching region is configured to direct the pressure pulse generated by the at least one actuator to deflect a selected particle from the stream of particles, and wherein the at least one actuator is external to the particle processing assembly and is operatively and removably interfaced with the switching region of the microfluidic chip.

13 . The system of claim 12 ,
wherein the particle processing assembly further includes a cartridge having fluid contact surfaces including a sample chamber, a keep chamber and a waste chamber, wherein the sample chamber of the cartridge is in fluid communication with the sample input of the microfluidic channel, wherein the keep chamber of the cartridge is in fluid communication with the keep output of the microfluidic channel, wherein the waste chamber of the cartridge is in fluid communication with the waste output of the microfluidic channel, and wherein all the fluid contact surfaces of the particle processing assembly are enclosed and configured to be sealed against liquid transfer to an exterior environment during a sorting operation.

14 . The system of claim 12 , further including a plurality of microsorters and a plurality of actuators wherein each actuator is associated with one of the plurality of microsorters.

15 . The system of claim 12 , wherein the at least one actuator is configured to be actuated in response to a desired particle characteristic of an individual particle being detected in a detection region of the microfluidic channel.

16 . The system of claim 12 , wherein the at least one actuator is configured to supply at least one of a mechanical, electrical, pneumatic or magnetic force to at least one switch element associated with the switching region.

17 . The system of claim 12 , wherein the operative interface between the at least one actuator and the switching region of the microfluidic chip includes a pre-stressed state between the at least one actuator and the particle processing assembly.

18 . A method for sorting particles comprising:
obtaining a microfluidic particle sorting component including at least one microsorter having fluid contact surfaces including a microfluidic channel having a sample input, a switching region, a keep output and a waste output; operatively interfacing the microfluidic particle sorting component with an operating machine, including aligning the switching region of the microfluidic particle sorting component with a pressure pulse generator external to the microfluidic particle sorting component and provided by the operating machine; operating the operating machine to process a sample having particles to be sorted, including the steps of:
flowing the sample containing particles through the microfluidic particle sorting component;
detecting whether individual particles flowing within the microfluidic particle sorting component have a predetermined characteristic;
causing the pressure pulse generator provided on the operating machine to generate a pressure pulse in the switching region of the microsorter in response to the predetermined characteristic of an individual particle being detected;
deflecting the individual particle from the particles flowing within the microfluidic particle sorting component into one of the keep output and the waste output; and
removing the microfluidic particle sorting component from the operating machine.

19 . The method of claim 18 , further including the steps:
providing the microfluidic particle sorting component as part of a cartridge assembly, the cartridge assembly having internal fluid contact surfaces including a sample fluid input reservoir and a selected particle fluid output reservoir; loading a sample containing particles into the sample fluid input reservoir of the cartridge assembly via a sealable sample input port; sealing the cartridge assembly against

Assignees

• Cytonome St Llc

Inventors

• Johnson Andrew
• Gilbert John R
• Deshpande Manish
• Lewis Hugh
• Bunner Bernard

Classifications

• C12N5/0081

  Purging biological preparations of unwanted cells · CPC title

• B01L2400/0442

  thermal energy, e.g. vaporisation, bubble jet · CPC title

• B01L2200/0652

  Sorting or classification of particles or molecules · CPC title

• B01L2400/04

  Moving fluids with specific forces or mechanical means · CPC title

• B01L2200/0636

  Focussing flows, e.g. to laminate flows · CPC title